The ArrayIterator::offsetExists() function is an inbuilt function in PHP which is used to check the existence of offset at the given index.
Syntax:
bool ArrayIterator::offsetExists( mixed $index )
Parameters: This function accepts single parameter $index which holds the index value to check the existence of offset.
Return Value: This function returns TRUE if the offset exists, otherwise returns FALSE.
Below programs illustrate the ArrayIterator::offsetExists() function in PHP:
Program 1:
<?php // Declare an ArrayIterator $arrItr = new ArrayIterator( array( "a" => 4, "b" => 2, "g" => 8, "d" => 6, "e" => 1, "f" => 9 ) ); // Display the offset value var_dump($arrItr->offsetGet("a")); // Check the existence of offset var_dump($arrItr->offsetExists("a")); // Unset the offset value var_dump($arrItr->offsetUnset("a")); // Check the existence of offset var_dump($arrItr->offsetExists("a")); ?> |
Output:
int(4) bool(true) NULL bool(false)
Program 2:
<?php // Declare an ArrayIterator $arrItr = new ArrayIterator( array( "for", "Geeks", "Science", "Geeks", "Portal", "Computer" ) ); // Print the value at index 1 echo $arrItr->offsetGet(1) . "\n"; // Check the existence of offset var_dump($arrItr->offsetExists(1)); // Unset the offset value var_dump($arrItr->offsetUnset(1)); // Check the existence of offset var_dump($arrItr->offsetExists(1)); // Print the value at index 0 echo $arrItr->offsetGet(0) . "\n"; // Check the existence of offset var_dump($arrItr->offsetExists(0)); // Unset the offset value var_dump($arrItr->offsetUnset(0)); // Check the existence of offset var_dump($arrItr->offsetExists(0)); ?> |
Output:
Geeks bool(true) NULL bool(false) for bool(true) NULL bool(false)
Reference: https://www.php.net/manual/en/arrayiterator.offsetexists.php
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